Sunflowers grow best when you sow seeds directly in the garden. Here are a few tips to keep in mind to ensure success.
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Sunflowers grow best when you sow seeds directly in the garden. Here are a few tips to keep in mind to ensure success.
Our editors and experts handpick every product we feature. We may earn a commission from your purchases.Learn more.
I once planted a flower bed with only sunflowers, choosing 10 varieties with varying heights and colors. It was quite a stunning garden, attracting pollinators first, then birds and squirrels when the seeds ripened.
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Sunflowers come in various heights, bloom sizes and colors, all easy to grow from seed. Some sunflowers to consider include:
When choosing sunflower varieties for your garden, remember taller varieties may need to be staked.
Sunflower seeds are readily available. You can pick up a packet of seeds for just a few dollars at most garden centers. I’ve even gotten free sunflower seeds from my local library’s seed library.
Plant in the spring once your garden is frost-free. Sunflowers will not tolerate frost and germinate best in warmer soils, so don’t jump the gun.
In areas of the country that don’t get frost, sunflowers are still generally grown from spring through summer.
If you’re concerned you don’t have a long enough growing season for sunflowers to bloom, check the seed packet to see how long on average it takes that variety to flower. If the number of days is shorter than your growing season, start seeds indoors a few weeks before your frost-free date.
Sunflowers don’t like to be disturbed, so it’s best to leave them where you sow them.
Here’s how to start them:
Whether starting seeds indoors or directly in the garden, choose a location with well-drained soil and full sun. Tall sunflowers can create a lot of shade, so plant them on the north side of full-sun flower beds to avoid shading out other flowers.
Sunflowers grow well with about an inch of rain a week, from rain or supplemental watering.
Overcrowded sunflowers won’t grow as well, so space seedlings out as directed on the packet. Some smaller sunflowers may grow well a foot apart. Larger sunflowers will need up to two feet between them.
If you often experience strong winds or storms, consider staking taller varieties of sunflowers to give them extra support. Put stakes in place before planting to avoid disturbing the seedlings later. Tie stems to stakes for support.
Sunflowers can benefit from additional fertilizer, especially if grown in a container. Use a general purpose fertilizer and follow the instructions on the label.
Sunflowers don’t get too many pests or diseases, though rabbits or birds may eat new seedlings as they emerge. If this is a problem in your garden, start seedlings indoors. Once planted in the garden, protect seedlings with a row covering until they’ve grown larger than the edible stage.
You can harvest sunflower seeds for bird or squirrel feed, or to eat yourself. Although technically all sunflower seeds are edible, we mostly eat the seeds from Helianthus annuus, the common sunflower.
When the flower head droops and the back of the flower turns yellow, the seeds are usually dry enough to harvest. If you’re concerned about birds getting to the seeds first, cover the flower head with cheesecloth or a paper bag. Or cut the flowers off, leaving a one-foot stem, and hang them where they can finish drying.
Check your local cooperative extension service for instructions on how to roast sunflower seeds, or use this information from Kansas State Research and Extension.